This work was supported by the Office of Naval Research. We thank Dr. Sang Ho Lee for cyclic voltammetry measurements and Dr. Joe Melinger for his help with the time-resolved PL experiment. M. A. W. acknowledges the National Research Council for administering the NRC postdoctoral fellowship program at the Naval Research Laboratory.
High-Performance Organic Light-Emitting Diodes Based on Dioxolane-Substituted Pentacene Derivatives†
Article first published online: 21 AUG 2006
Copyright © 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Functional Materials
Volume 16, Issue 15, pages 1943–1949, October, 2006
How to Cite
Wolak, M. A., Delcamp, J., Landis, C. A., Lane, P. A., Anthony, J. and Kafafi, Z. (2006), High-Performance Organic Light-Emitting Diodes Based on Dioxolane-Substituted Pentacene Derivatives. Adv. Funct. Mater., 16: 1943–1949. doi: 10.1002/adfm.200500809
- Issue published online: 21 SEP 2006
- Article first published online: 21 AUG 2006
- Manuscript Revised: 28 APR 2006
- Manuscript Received: 14 NOV 2005
- Office of Naval Research
- Charge transfer;
- Light-emitting diodes, organic;
Organic light-emitting diodes (OLEDs) containing red-light-emitting dioxolane-substituted pentacene derivatives are fabricated and characterized. The OLEDs feature guest–host emitting layers consisting of either 6,14-bis(triisopropylsilylethynyl)-1,3,9,11-tetraoxa-dicyclopenta[b,m]pentacene (TP-5) or 2,2,10,10-tetraethyl-6,14-bis(triisopropylsilylethynyl)-1,3,9,11-tetraoxa-dicyclopenta[b,m]pentacene (EtTP-5) dispersed in tris(quinolin-8-olato) aluminum(III) (Alq3). High external electroluminescence (EL) quantum efficiency (ηEL = 3.3 %), not far from the theoretical limit, is observed for an OLED device based on a dilute EtTP-5:Alq3 emitting layer (0.25 mol % EtTP-5). The proposed EL mechanism is a combination of Förster energy transfer and direct electron–hole recombination on the guest pentacene molecules, as inferred by changes in the EL versus photoluminescence spectra and the positions of the highest occupied molecular orbital and lowest unoccupied molecular orbital gap of the guest within that of the host (estimated via cyclic voltammetry). Further evidence of charge trapping is provided by increased operational voltages at increased guest-molecule concentration.